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Workaround: change Bundle Identifier and/or Version.

I restored a profile from Time Machine when this was working and upon launch, Xcode immediately deletes and replaces it with a new one. The key difference seems to be the old profile has the get-task-allow entitlement while the new one has NO entitlements. This is definitely broken at Apple's end.

Edit: The entitlements should also include a keychain access group, but again, no entitlements at all. Should look like:

Seems Apple broke the automatic signing system.
I was playing around with a few projects and Xcode just fetches the incorrect profile

This worked for me:

1. Turn off "Automatically manage signing" in project target


2. Go to ~/Library⁩/⁨MobileDevice⁩/⁨Provisioning Profiles⁩


3. Remove previously downloaded profiles


4. Turn on "Automatically manage signing" again

This issue has been resolved BUT some people still have problem with it. If you're one of them, try the following:

1. In the General tab of target settings - uncheck the Automatically manage signing option

2. Close Xcode (fully, not just your project)

3. Erase .mobileprovision files under ~/Library/MobileDevice/Provisioning Profiles/

4. In Keychain Access, delete the following:

• iPhone Developer: youremail@email.com


• Developer ID Certification Authority


• Apple Worldwide Developer Relations Certification Authority 3.

5. Delete the app on your iOS devices

6. Restart your Mac and iOS devices

7. Open Xcode again

8. Change the Bundle Identifier (even if its a single character, you'd change it back to the original after you get it going)

9. Check the Automatically manage signing option

10. Use USB to connect your iPhone/iPad.

11. Make sure you trust your certificate on your iOS devices

This should do work for you.

UPDATE: This solution still works as on 2019/Mar/20 7:00 UTC+0

SOLUTION: no XCode reinstallation required. I used a brand new free AppleId, but later checked with my old AppleID and it also works.

1. In XCode, under the General tab, untick the Automatically manage signing option


2. Close XCode.


3. 
   

   Erase old profiles in ~/Library/MobileDevice/Provisioning Profiles :

   
   
   

   cd ~/Library/MobileDevice/Provisioning Profiles

   
   
   

   rm -rf *

   
   


4. 
   

   On MacOS, run Launchpad->Other->Keychain Access and remove all certificates related to iPhone development, like the following four on the picture:

   
   
   
   
   
   • Apple Worldwide Developer Relations Certification Authority
   
   
   • Developer ID Certification Authority
   
   
   • iPhone Developer: your_name_or_email
   
   
   
   

5. Uninstall old app on iPhone, restart both iPhone and Mac


6. Open XCode and change the Bundle Identifier of your app, at least one character (later you may revert this change)


7. Enable the Automatically manage signing option in XCode.

After this you should be able to run and debug your app on your device.

If you have a “iPhone has denied the launch request” problem, the solution is https://stackoverflow.com/a/54990369/3824328.
In short, you need in XCode to go to menu Product->Scheme->Edit Scheme... and select Executable: ask on launch

EDIT

As per latest update Apple successfully resolved Automatically Code
Sign with Free Account issue.

I tried it and I can confirm its resolved.

Please try at your end.

I am also facing the same issue while I am creating a new Profile from XCode and if I go to other projects and check over there also I am facing the same issue as below.

Due to this issue none of my project able to build with old profile & certificate.

The strange issue so I checked newly created Profile and compare with old one and I found that App ID is unknown as well as there are no Entitlement details in newly created profile.

Check below screenshots of Old and New profile comparison:

Old Profile:

New Profile:

So means it's not able to set App Id and Entitlements in the new profile. Which will result to not work all old profile and giving the same error in all projects.

Issue Workaround:

Step1: Go to Provisioning Profile folder (path: ~⁨Library⁩ ▸ ⁨MobileDevice⁩ ▸ ⁨Provisioning Profiles⁩).

or use a shortcut to jump directly into this folder like CMD + SHIFT + G and enter ~/Library/MobileDevice/Provisioning Profiles it will redirect your finder directly on Provisioning Profiles folder.

Step2: Short folder by Date Modified.

Step3: Check profile with Unknown App Id and delete all unknown profile.

Step4: Come back on XCode and check all old project will work as expected.

Note: Make sure new app which causing this problem keep that project
closed otherwise it will create a new profile with Unknown App Id.

Hope this will helps and apple will solve this bug soon!

It seems that this problem has been resolved now and the personal accounts can resign their apps automatically again.

Regarding to @Paul answer, it is not related to uninstalling Xcode. Its is fixed from server side.

The only thing that is required is removing Apple Developer Certificate (for the personal account) from your keychain, so that Xcode retry to generate and download new one.

Here is the solution:

1. let xCode be open.




2. select your developer account and let the error appears again.




3. Go to keychain App

4.a) Goto certificate section

4.b) remove All (valid and invalids) certificates ( I have 3 valid and many invalid!)

5. After removing the last certificate, mac os will recreate a new certificate for the active developer account automatically




6. Run your app in your iDevice. You need to enter your system password to add newly created certificate into the Keychain.

If in second run it says

Your iPhone has denied the launch request

just goto:

Product > scheme > edit scheme: uncheck "debug executable"

I hope it solves your problem.

Maybe this might help? Apple Developer Forums

Talks about Apple refusing to build iOS applications under SDK 12 as of March 2019 (OP from Dec 2018).

I've not yet tried this but it may be linked to the issue, I have a free developer account and am also experiencing this bug.

Here's a screenshot incase the link changes (screenshot 1 below).

Edit: this is the link from the first screenshot (screenshot 2 below)

1

2

I am finally able to deploy to our iOS devices again. Here are the steps I took to make it work.

First, I followed all 10 steps in Zameer's answer here. I have copied them below:

1. Open your project in XCode.


2. Select your project from the project navigator and then select your target from the column.


3. Click on the General tab and under the Signing section, make sure "Automatically manage signing" is enabled.


4. Click on the Capabilities tab and turn On both the "App Groups" and "Keychain Sharing" settings. This might raise an
   "Automatic signing failed" popup error, just click cancel to make it go away.


5. This should generate a entitlements file for you named nameProject.entitlements in the project folder of your project navigator.


6. Move this entitlements file outside of the folder, just below your project file.


7. Select your target again and return to the Capabilities tab to turn Off both the "App Groups" and "Keychain Sharing"
   settings. This again might raise an "Automatic signing failed" popup
   error, just click cancel to make it go away.


8. Now select your project above the target and go to Building Settings tab.


9. Scroll down to the Code Signing Identity setting under the Signing header and select iOS Developer from each drop down.


10. Under the above Signing header, double click the text field beside the Code Signing Entitlements and enter the name of your
    entitlements file, nameProject.entitlements.

After completing those 10 steps, the 2 red entitlement error messages in XCode went away and I was able to build and deploy the XCode test app to the iPhone and run it.

Although that XCode test app could build and deploy, I develop on a PC using Xamarin and I was unable to deploy my Xamarin.iOS application to my iOS devices and kept getting an error in Visual Studio: the executable was signed with invalid entitlements. I did the following things and now I can deploy my Xamarin app and run it on my iOS devices:

1. I deleted the provisioning profile from the Mac in the ~/Library/MobileDevice/Provisioning Profiles directory. XCode immediately generated a new provisioining profile (I'm not sure if this step was necessary but I'm just writing it because that's what I did).


2. I changed my Xamarin.iOS.csproj file and removed Entitlements.plist from the CodesignEntitlements element so it now just looks like <CodesignEntitlements></CodesignEntitlements>. Visual Studio automatically added two elements to the same propertygroup in the project which are probably not necessary but I thought I'd mention: <CodesignExtraArgs /> and <CodesignResourceRules />.

For me, it finally works again. Either they just fixed it or any of my other steps helped:

1. Uninstall Xcode and all related files (using AppCleaner)


2. Install Xcode via the App Store


3. Change the Bundle Identifier of the App


4. Remove all "iOS Developer" Keys from Keychain

Here is a temporary workaround

1. 
   Change Bundle Identifier : Target > General > Identity > Bundle Identifier (Set this to a different value than it is right now)


2. 
   Change Version : Target > General > Identity > Version


3. 
   Disable debug executable : Product > Scheme > Edit Scheme, (Uncheck the box that says "debug executable")


4. 
   Delete Provisioning Profiles: ~/Library/MobileDevice/Provisioning Profiles delete everything in this folder

You now should be able to build and run projects on simulators and devices.

One other potential source of this error. If you do not have a valid signed development certificate setup within your Xcode environment it will throw similar errors as posted by OP.

you can check out your development certs status following the apple link here

I got it to work by doing the following steps:

1. Go to xCode


2. Preferences


3. Accounts


4. Manage certificates


5. Plus sign


6. iOS Development


7. Done


8. Download manual Profiles


9. Close


10. Go to your target


11. Change development team to none


12. Change development team to your previous team


13. Enjoy!